The idea that Windows made CTRL-ALT-DEl well known is the utterest nonsense. It's something every PC user knew well before Windows 1.0 shipped. Most PCs had their power switch way in the back. If you were in a program that lacked an exit function, which was once quite common, or something locked up, again quite common before Windows was a factor, CTRL-ALT-DEL was a far more convenient way to reset the machine that reaching for the power switch.